Well at least not old enough to not hear this teenager sound! The test will produce a tone that is generally only heard by people under the age of 25. It has been used as a deterrent device to keep teenagers from loitering in malls and shops, and sounds similar to a buzzing mosquito. The elderly and people with hearing damage often cannot hear the sound. Nice to know I am not that old 😛 Click on the box and get your youth back haha 😀
Hope you are having a nice day out there on the interwebs! 🙂